JP2989377B2 - Constant temperature device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermostatic apparatus for drying medical instruments and samples by controlling the temperature of a thermostatic chamber to a predetermined temperature, and for aging and water evaporation in the field of engineering.

[0002]

2. Description of the Related Art Conventionally, this kind of constant temperature apparatus is disclosed in
As shown in Japanese Patent No. 3281, the temperature of the room can be controlled. That is, an inner plate provided at a predetermined interval so as to form a ventilation path in an inner box forming a constant temperature chamber, a blower provided in the ventilation path, an air outlet and a suction port provided in the inner plate. A mouth, a heating means disposed in an air passage near the suction port, a fan guard fixed to an inner plate so as to cover the suction port, a temperature sensor provided near the fan guard, and the temperature sensor And a control device for controlling the heating means and the blower based on a signal from the controller to control the inside of the constant temperature chamber to a predetermined temperature.

Here, the temperature sensor is usually constructed by housing a thermocouple in a relatively long and thin stainless steel cylinder and attached to the inner box or inner plate.

[0004]

However, according to the above arrangement, the temperature sensor has a relatively large elongated shape, so that its mounting location is restricted to an inner box or an inner plate slightly away from the suction port. . For this reason, there has been a problem that the response to the temperature in the constant temperature chamber is poor and a control delay occurs. Further, if the temperature sensor is mounted near the suction port to improve the responsiveness, the structure of the fixing bracket becomes complicated, the number of parts increases, and the mounting operation becomes complicated, which is not practical.

The present invention has been made in order to solve the above-mentioned problem, and enables a temperature sensor to be mounted in the vicinity of a suction port with a simple structure without complicating the structure of a fixture, thereby improving responsiveness. An object of the present invention is to provide a constant temperature device with high accuracy of temperature control.

[0006]

According to the present invention, there is provided an air outlet and a suction port provided on an inner plate forming a constant temperature chamber, a heating means and a blower disposed near the suction port, and A fan guard fixed to the inner plate so as to cover, a temperature sensor provided in the vicinity of the fan guard, and controlling the heating means and the blower based on a signal from the temperature sensor to bring the constant temperature chamber to a predetermined temperature. In a constant-temperature device provided with a control device for controlling, the fan guard is provided with a regulating portion for regulating displacement of the temperature sensor.

[0007]

According to the constant temperature apparatus of the present invention, one end of the sensor is fixed to the inner plate or the inner box, while the other end is the free end, even if the temperature sensor is a relatively long and slender cylindrical one. The sensor is housed in the regulation part of the fan guard, which prevents the free end of the elongated sensor from falling down, and reduces the number of parts by using the sensor fixing bracket only at one end, while simplifying the mounting work. Can be arranged near the suction port, and the accuracy of temperature control can be improved.

[0008]

Next, embodiments of the present invention will be described. 1 is a thermostat of the present invention. The thermostatic apparatus includes a heat insulating box 4 filled with a heat insulating material between an outer box 2 and an inner box 3, and a glass door 5 for opening and closing the opening of the heat insulating box 4. A constant temperature chamber 6 for accommodating a sample or the like is formed in the inner box 3, and a plurality of net shelves 8 supported by shelf columns 7 are arranged in the constant temperature chamber 6. An inner plate 11 is arranged inside the right side plate 9 forming the inner box 3 at a predetermined interval so as to form a ventilation duct 10. This inner plate 1
An air outlet 12 is formed at the upper and lower ends of 1, and an air inlet 13 is formed at the center. Reference numeral 14 denotes a centrifugal blower disposed in the ventilation duct 10 corresponding to the suction port 13. Reference numeral 15 denotes a suction port 13 in the ventilation duct 10.
Is an electric heater arranged in an annular shape around the periphery of the electric heater. Reference numeral 16 denotes a fan guard fixed to the inner plate 11 with screws 17 so as to cover the suction port 13. Reference numeral 18 denotes a temperature sensor for temperature control provided near the fan guard 16, and reference numeral 19 denotes an auxiliary temperature sensor for backup provided near the fan guard 16 in parallel with the temperature sensor 18. The auxiliary temperature sensor 19 detects an abnormal temperature and stops the operation of the constant temperature device 1 when a control board of the control device 24 described later breaks down. These two temperature sensors 1
8 and 19 are formed to be elongated by storing the thermocouple in a stainless steel tube. The two temperature sensors 18 and 19 have one ends fixed to the right side plate 9 of the inner box 3 with screws 20 at the other end of a mounting bracket 21 having an L-shaped cross section. Here, a restriction portion 23 projecting into the ventilation duct 10 by bending a wire is formed in a part of the fan guard 16, and the central portions of the temperature sensors 18 and 19 are placed in the restriction portion 23. Installed to accommodate. As a result, most of the temperature sensors 18 and 19 are located within the range of the suction port 13. At the right end of the outer box 2, there is provided a control device 24 for controlling the energization of the blower 14 and the electric heater 15 based on a signal from the temperature sensor 18 to control the inside of the constant temperature chamber 6 to a predetermined set temperature. Built-in. Reference numeral 25 denotes a display panel for displaying the set temperature and the internal temperature, and 26 denotes an operation panel such as an operation switch and a temperature setting switch.

In the thermostatic apparatus configured as described above,
When the operation switch of the operation panel 26 is turned on and the operation is started, the electric heater 15 and the blower 14 are operated, and the air heated in the ventilation duct 10 is supplied from the air outlets 12 at the upper and lower ends of the inner plate 11 into the constant temperature chamber 6. At the same time as the air is blown out, the air is sucked in from the suction port 13 and the heated air is circulated in the constant temperature chamber 6. At this time, the electric heater 15 and the blower 14
Based on the signal detected by the temperature sensor 18, the controller 24 controls the energization so that the inside of the constant temperature chamber 6 has a preset temperature.

The two temperature sensors 18 and 19 have one ends fixed to the right side plate 9 of the inner box 3 by screws 20 (fixing means), and the other ends of mounting brackets 21 (fixing means) having an L-shaped cross section. 22 (fixing means), the center of which is accommodated in a regulating portion 23 formed by bending the fan guard 16 so that the temperature sensor 1
Even if 8, 19 are relatively large and slender cylindrical ones,
One end of each of the sensors 18 and 19 is fixed to the right side plate 9 of the inner box 3 via the mounting bracket 21, and the other end serving as a free end can be fixed by being housed in the regulating portion 23 of the fan guard 16. As a result, it is possible to prevent the free ends of the elongated sensors 18 and 19 from falling down, to reduce the number of parts and to simplify the mounting work by using the fixing bracket 21 of the sensors 18 and 19 only at one end. 19 can be arranged in the vicinity of the suction port 13, and the accuracy of temperature control can be improved.

[0011]

As described above, according to the constant temperature apparatus of the present invention, one end of the sensor is fixed to the inner plate or the inner box even if the temperature sensor is a relatively long and thin cylindrical one. The free end of the elongated sensor can be prevented from falling down by accommodating the other end, which is the free end, in the regulation part of the fan guard. While trying to
It is possible to arrange the sensor near the suction port,
The accuracy of temperature control can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a thermostat of the present invention.

FIG. 2 is a sectional view of a main part of the thermostat.

FIG. 3 is a front view of a main part of the thermostat.

FIG. 4 is a perspective view of a main part of the thermostat.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 constant temperature device 3 inner box 6 constant temperature room 9 right side plate 10 ventilation duct 11 inner plate 12 blowout outlet 13 suction port 14 blower 15 electric heater 16 fan guard 18, 19 temperature sensor 21 mounting bracket 23 regulating part

Claims (1)

(57) [Claims] 1. An air inlet (13) provided in an inner plate (11) forming a constant temperature chamber (6), a blower (14) arranged in the vicinity of the air inlet (13), and (13) Fixed fan guard (1)
6), a temperature sensor (18) provided near the suction port (13), and a heating means (15) based on a signal from the temperature sensor (18).
And a control device that controls the blower (14) to control the inside of the constant temperature chamber (6) to a predetermined temperature, so that the temperature sensor (18) is located near the suction port (13), Fixing means (20, 21, 22) for fixing one end side of the setting temperature sensor (18); and the temperature sensor (1) provided on the fan guard (16).
8) A constant temperature device comprising: a restricting portion (23) for restricting the displacement of (8).